Audi RS 5 (2015) is 3 mm (0.12 inch) wider than Opel Insignia Sports Tourer (2014).
Opel Insignia Sports Tourer (2014) is 265 mm (10.43 inch) longer, 144 mm (5.67 inch) higher, 237 kg (522 lbs) lighter and has 220 liters (7.77 ft3) bigger cargo space than Audi RS 5 (2015).